Alarm-lock



2 sheets-sheet 1. J. W. KOEN.

(No Model.)

ALARM- LOCK.

Patentedjneu. 2, 1384.

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(No Modem 4 2 sheets-sheet 2.

r J. W. KOEN.

ALARMVLOGK.

No. Patented 1390.2, 1884.

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JACOB VILLIAM KOHN, OF NEWARK, NEW JERSEY.

ALARM-LOCK.

SPECIFICATION forming part ofgLetters Patent No, 308,678, dated December 2, 188%. Application inea Mays, iss/4. No modem To @ZZ whom, it may concern,.-

Be it known that I, JACOB WILLIAM KOEN, a citizen of the United States, residing at Newark, in the county of Essexand State of New Jersey, have invented certain new and useful Improvements in Alarm-Locks, and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The object of this invention is to reduce the cost of constructing alarm-locks, and to increase the utility ofthe same.

It consists in the arrangements and combi nations of parts substantially as will be hereinafter set forth, and finally embodied in the clauses of the claims.

Referring to the accompanying drawings, in which similar letters of reference indicate like parts in each of the several figures, Figures l and 2 are views of the interior of the lock, showing different positions of the working parts; and Figs. 3, 4, 5, and 7 are detailed views of certain pawl-and-hammer mechanism for striking an alarm. Fig. 6 is a detailed elevation of a devicer for repressing a night latch or bolt. Fig. S, Sheet 2, is a planof the exterior case, showing the same covering the bell, and a slot to receive the nger-piece of the night-latch; and Fig. 9 is an end view showing a similar slot through which a lever.

projects, said lever being adapted to repress the hammer, so that an alarm will :not be sounded when the door-knob is turned.

In said drawings, a is the lock-case, bis the shank of the door-knob, and c is apiece or tumbler secured upon and working with said shank, and operating the alarm mechanism and the latch or bolt d. Said piece c or tumbler is provided with a toothed segment or segmental ratchet, c, which engages a pawl, Said pawl carries the alarm-hainmer h, and causes it to strike the bell when induenced by the spring 't'. The teeth of the segment engaging the pawl throws said pawl, and with it the hammer, away from the bell until the pawl rides over the projections or ratchet-teeth and :ment by-the stop-lug 0.

to return to its normal position after it has been .bent down by the returning ratchetvteeth of the segment. The latch d is actuated by the lug or finger Zon the tumbler c, which engages a projection, m, on said latch, saidlatch sliding on the pin m and between the lugs an, and being limited in its inward move- The said latch or bolt, together with the night latch or bolt q, is thrown outward by the spring r, coiled around a stud, s, and having its opposite eX- tremities bearing against the said bolts or latches d and q, which are appropriately notched or recessed to receive the same. The night-latch slides in suitable guides or ways similar to those used in connection with the latch d, and is repressed by a tumbler, s', of peculiar construction, pivoted, as shown in Fig. 6, between the lock-plates a.' Said tunibler has a finger, t, to engage a projection, u, on the night-latch, and a shank, o, projecting through the case to receive a key. The shape of said shank may be varied to suit individual keys. To hold the said night-latch in a repressed position, there to remain during the day-time, I provide a ringer-piece adapted to be worked from the outside of the case, the

shank w of which slides in the groove 1o in the lock-case a, as in Fig. 8. Said shank w is adapted to be caught in the notches fw nr, the former of which holds the latch or bolt in a projected position, so that said lock cannot be opened from the outside even by the aid of a key, and the latter holds said bolt back in an inoperative position. To allow the shank tobe readily raised or lowered into or from said notches, I secure it to a piece, 105, Figs. 1 and`2, having a vibratory motion on but independent of the latch, as will be understood. The alarm mechanism is entirely inclosed by the lock-case a, as shown in Fig. 8, the bell being covered by a shield in a degree conforming to the shape of said bell, and formed IOO or cast integral with said case. By this construction the shield guards against the bell being muffled, and being thus prevented from sounding an alarm when the knob is turned. The shield may be provided with openings, to allow the escape of the sound therethrough, said openings also being shown in Fig. 8. To hold the pawl back, so that When not needed it Will be prevented from sounding an alarm, I provide a latch or lever, a', fulcrumed upon the case a at a?, and having a ringer projection, a, passing outward through the slot at the edge of the case a. tremity of said lever is bent or hooked7 as at a5, so as to strike the pawl or hammer thereon and hold it back, so that the ratchet will not engage with it to strike an alarm.

Having thus described the invention, what I claim as new isl. In combination with the bell, hammer, and segmental ratchet, the jointed pawl, and a spring adapted to throw the hammer and paWl forward to strike an alarm, substantially as set forth.

2. In combination, in an alarm -lock, the knob-shank, the tumbler c, secured thereon, and having the lug Z and segmental ratchet, the pawl operating the hammer, the latch d, and bell, all said parts being arranged and operating substantially as set forth.

The opposite eX-y 3. In combination with the slotted case a, the night-latch having the shank w, Working in the slot therein, the spring o", the tumbler having a finger to engage with said latch, and a key-shank projecting through the case a, substantially as and for the purposes set forth.

4. In an alarm lock, the combination ofthe knob shank, tumbler, latch d, segmental ratchet carried by said tumbler, the jointed pawl, the hammer secured to the head thereof, and the bell, all said parts being arranged and operating substantially as and for the purposes set forth.

5. In combination, in an alarm-lock, the jointed pawl carrying the bell-hammer, and

a lever'extending from said paWl tothe out- JACOB VILLIAM KOHN.

lVitnesses:

CHARLES H. PELI., F. F. CAMPBELL. 

